Reversible loom dobby knife



Sept. 4, 1928.

J. -w. GILES REVERSIBL LOOM DOBBY KNIFE Filed May 25, 1926 Patented Sept. 4, 1928.

,UNITED STATES PATENT err-ice.-

Jonn w. GILES, on GREEK, sonTn CAROLINA, Assrenon To oRoMPToiv & KNOWLES LOOM wonxs, or woncnsrnn, MASSACHUSETTS, A CORPORATION or MASSACHU- SETTS.

' REVERSIBLE LOOM DOBIBY KNIFE.

Application filed May 25,

This invention relates to improvements in loom dobbies and it is the principal object of the invention to provide a reversible dobby knife to cooperate properly in either position with the hooks of the dobby.

The form of pattern control mechanism which isv known in this country as a dobby con'iprises a pair of spaced knives which reciprocate in opposite directions and cooperate with hooks arranged in sets, one set for each knife. A pattern chain controls the vertical position of the hooks by means of so-called dobby fingers, a peg on the dobby chain lifting the corresponding finger to depress the associated hook and the hooks are connected in pairs to the dobby levers which in turn actuate the harness jacks. The knives are given their reciprocatlng movement, by means of two rocker arms,one

for the front ends and one for the rear ends of the knives, the rocker arm at therear giving a slightly greater motion to the rear have had but one operative hook engaging edge which has usually been chilled in the molding operation and is so placed in the (lobby as to engage the hooks when the latter are depressed. In order 'toinsure continued contact between the hooks and the knives the latter have their hook engaging faces inclined downwardly and inwardly with respect to the hooks and it is a further object of my invention to provide a reversi- 'ble dobby knife having two faces similarly disposed with respect to the axis of the knife and each so formed as to be downwardly and inwardly inclined when present ed to the hooks.

It is a further object of the invention to provide a reversible dobby knife having a plurality of similarly formed hook engaging portions all of which may assume the same relative position with respect to the guiding ways and the hooks to the end that 1926. Serial No. 111 658.

tion to provide a reversible dobby knife so formed that in any of its positionsit will have a receding upper face to engage and ralse the hooks with a smooth motion.

With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth-in the claims.

In the accompanying drawings wherein-1 have shown one of several forms of (lobbies which may be used with my improveddobby knife,

Fig. 1 is a front elevation of a dobby and adjacent loom parts, a part of the dobby being broken away to show my improved knife in section,

Fig. 2 is a top plan view of the improved knife,

Fig. 3 is an enlarged cross section on line of Fig, 2 showing the adjacentysupporting ways,

Fig. 4 is a perspective View of the knife,

and Y Fig. 5' is a diagrammatic vertical section through the dobby showing the relation of the knife, hooks, controlling lingers, and pattern chain; I

Referring to the drawings it will be seen that I have provided a loomside l0, archll,

and dobby support 12. The dobby is formed of a pair of parallel spaced front and rear Sides 13 and 14;, respectively, between which extends a pin 15 on which is p'ivotallymounted a plurality of harness jacks 16. Each of the latter is pivotally connected to a 'dobby lever 17 the upper andvlower en'ds of which are connected respectively withjhooks 18 and 19.

As indicated in Fig. 5 the pattern chain 20 controls the vertical position of a plurality of dobby fingers 21 some of which have their inner ends upturned as at 22 to engage the lower hooks 19 and the others of which cooperate with lifter rods 23 to control the vertical position of the upper books 18. Said fingers move pivotally about a pin 24 fixed in the dobby sides. By means of the pattern chain 20, which may be given a 'movement eve A rocker shaft is journaled in thesidesl 13 and l4 and has keyed thereto; a pair of rocker arms 26 one only of which is shown in Fig l. Said. rocker arms. are oscillated by meansiof a connector 27 which receives .a regular vertical reciprocating movement every ,pick'of the loom. The upper and a lower arts of the rocker'arms are provided with llnks 28"and 29, respectively, by means are oscillated. i V A p My improved knife is shown more particularly in Figs. 2, 3, and fl, andjcomprises va pair of aligned gudgeons 40 which receive of which the dobby knives togbedescribe'd the outer ends of the links. Adjacent each gudgeon is a guide and supporting portion 4 1;which may berectangular in section and formed with a slight depression {12 defining spaced bearing surfaces. Said supporting portionsmoveon ways 43gwhich in effect-are the lower sides ofislots 44 formed in the upperand lower portions of 'bothfrontand back frames, there beingitwo; ways forieach knife. I

v r The portion of the between the guides 41 issubstantially the s'amein cross section as indicated in Fig. 3, having a pair of acute angled edges 45 formed by an inl clined face {16 on the narrower part ofthe knife and the recedingface 47 on'thebroadel portion of the knife. The edgesA5 may be I chilledwif desired andboth edgesare lsyni- 'metrically disposed with respect to the axis ofthe gudgeons lQ. Theysare also placed so that in either 'positionwf the n fe the h edge which cooperates with the hooks will be at the same'vertical distance above theads ,jacent ways 43, It is desirable to havethe edges notfionlyj the same vertical distance *hbo vethe ways, but alsothe same horizontal "distance from: theaxis of the gudgeonsflfl so that when a reversalis made the'rnew edge "45 j'will assume the same "position with .i re} spectto thehooks' as previously existed with the old edge 45 ,As' shown inFig."3 the obtuse angled edges; defined by the intersections of the faces 46 andifl'? are rounded so as to cooperate with theunder edges of the hooks to give the latter a meqauyyrising motion when said hooks are inlower position and are to engaged byy the knifejon thenextoutward movement thereof. L r

'Theparts of the dobhy setforth in 1 are "well, understood with the exception 7 of the improved knifefland it is deemed that ing dobby hooks, said sary, theupper knife moving in one direction while the lower knife moves in the I opposite direction and the selected -hooks producing the desired movement of the associated harness jacks eitherto cause vertical movement of the corresponding harness frames (hot shown) or to leave them unmoved; p From the foregoing it will be seen that I have providedan improved dobby knife for the hooks of jdobbies so formed as to have a plurality of edges each of which may be i presented to the hooks sothat when one edge s wornoribecomes chipped another ed e can be used without discarding the kni c. It 7 will further bejseen that the broad upper surface of theknife inany' of the different a "positions is inclined slightly and terminates r in a rounded portion which cooperates with y, the hooks to glve the same an easy nsmganotion. Obviously, thefprinciple setforth hereinisnot limitedzin application to a knife "111a having but two working edges. It'will be seen from an inspection of Fig; 3 that the center of gravity of the hook engaging por; M tion of the knife is in substantial alignment with the axis ofrthe'gudgeons.

Having thus described"my invention, it

willbe apparent that changes and modificationsmaybe madetherein by those skilled in the art without departing from the spirit and scope of the-invention, aIIdQI dQ not wish toabe limited to the details herein disclosed but what I claim is 2 a I 15. A reversibl e vdobby knifefor 1561115 hav 1" ring dobhyhooks said knife having atthe 3 ends thereof; aligning gudgeons andhavin between the gudgeons a pluralit of kni e edges to ei gage the hooks, said e ges all being symmetrically disposed with respect t0 theaxislof the glldgeon'spv .1

2. A reversible dobby knife for looms havknife 'havin aligning gndgeons on the ends thereof and havin intermediate the gudgeons a plurality of 00k engaging portions, said portions being substa'ntiallythe same distance from andsym- .metriollydisposed with respect to the axis of the gudgeons.

v a. A reversible (lobbyikniai fomiitby 4 having hooks, said knife havingfaligning gudgeonsj at theends thereof QHd haViHgLthE v intermediate :hookfenga ing portions be-- tween the gudgeons of Sue cross sectionlthat the horizontal dimension thereof is greater thanthe verticaljdimension; the longer 'top andbottom faces being inclined to cooper 1 ate with the hooks to raise the same gradu ally,v and the shorter side portionsbeing in- .clmed to form withthe top and bottom po r tions a plurality of acute angled hook enrgaging iedgespalliof saidedges being sym- :1 Ymetricall disposed withirespect tothe axis of thegudgeons. further explanation of the same is unneces- 4. A reversible dobby knife for 'dobbies having hooks, said knife having a guide portion adjacent each end thereof, each guide portion having opposite bearing surfaces, the intermediate hook engaging portion of the knife having a plurality of hook engaging edges which are similarly disposed with respect to the bearing surfaces.

5. A reversible dobby knife for dobbies having hooks, said knife having aligning gudgeons at the ends thereof and having bearing portions having upper and lower flat bearing surfaces symmetrically placed with respect to the axis of the gudgeons, the intermediate hook engaging portion of the knife having a plurality of hook engaging edges, the edges all being equally spaced from the adjacent fiat bearing surfaces.

6. A reversible dobby knife for dobbies having hooks, said knifehaving gudgeons at the ends thereof and having bearing portions having upper and lower flat bearing surfaces, the intermediate hook engaging portion of the knife having a plurality of hook engaging edges, the edges all being equally spaced from the adjacent fiat bearing surfaces, the gudgeons lying midway the knife ed 'es in a horizontal direction.

7. In a loom dobby, a plurality of dobby i hooks, a knife for the hooks, Ways on which the knife is slidably mounted, said knife hav ing a plurality of hook engaging edges and said knife being reversible to present each of the edges to hook engaging position, each hook engaging edge when in operative hook engaging position being the same distance from the ways.

-8. In a loom dobby, a plurality of hooks, a knife for the hooks having aligning gudgeons at the ends thereof, links for the gudgeons by which the knife is reciprocated, said knife having a plurality of hook engaging edges, said knife being reversible to present any one of the edges to hook engaging position, the edges all being symmetrically disposed with respect to the axis of the gudgeons.

In testimony whereof I have hereunto af- I fixed my signature.

JOHN W. GILES. 

